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    <h1>第一章作业</h1>
    <h2><a href="diyi1.html">案例1</a></h2>
    <h2><a href="diyi2.html">案例2</a></h2>
    <h2><a href="color.html">颜色</a></h2>
    <h2><a href="default.html">返回</a></h2>
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